Sanitary napkin



FIG. 1 is a top plan view of a sanitary napkin showing my new design;

FIG. 2 is a side elevation thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is an end elevation thereof;

FIG. 5 is a modified top plan view of the design illustrated in FIG. 1. 

The ornamental design for a sanitary napkin, substantially as shown and described. 